[SPv2] Associate effect property nodes for SVG paint chunks

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
index 165538ff94d47c1aaa21db5523ae1217814c8971..efda5e49c017d5fcbb9f16095b5d641dd0a3208c 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
@@ -10,6 +10,7 @@
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/svg/LayoutSVGRoot.h"
+#include "core/layout/svg/SVGLayoutSupport.h"
 #include "core/paint/FindPropertiesNeedingUpdate.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintLayer.h"
@@ -364,10 +365,10 @@ void PaintPropertyTreeBuilder::updateEffect(
     PaintPropertyTreeBuilderContext& context) {
   const ComputedStyle& style = object.styleRef();
 
-  // TODO(crbug.com/673500): style.isStackingContext() is only meaningful for
-  // HTML elements. What we really want to ask is whether the element starts
-  // an isolated group, and SVGs use a different rule.
-  if (!style.isStackingContext()) {
+  const bool isIsolatedGroup =
+    (object.isBoxModelObject() && style.isStackingContext()) ||
+    (object.isSVG() && !object.isSVGRoot() && SVGLayoutSupport::willIsolateBlendingDescendantsForObject(&object));
+  if (!isIsolatedGroup) {
     if (object.needsPaintPropertyUpdate() || context.forceSubtreeUpdate) {
       if (auto* properties = object.getMutableForPainting().paintProperties())
         context.forceSubtreeUpdate |= properties->clearEffect();